When performing operations such as intersection, merge, XOR, or line connection on geometry, it is necessary to consider the attribute assignment of the newly generated objects. The application provides the Property Processing dialog box, allowing users to set attributes for objects after the operation. Here, the merge operation will be used as an example to explain the Property Processing dialog box.

Editing Layer

Editing Layer The drop-down list on the right side lists the editable layers in the Layer Manager. When multiple layers are editable, you need to select the layer for the merge operation, i.e., which layer the objects will be merged into. Objects in other layers remain unchanged.

List Box

The list box displays the names, types, and operation steps for each field value after merging for all non-system fields and editable system fields of the merged objects. To modify the operation step for a field, select the field in this list box, then reselect the operation step in the Actions column.

Parameter description

• Null: Indicates that the value of this field in the union result object is null.
• Sum: Indicates that the value of this field in the union result object is the sum of the corresponding field values of each merged object. For numerical fields, it is a direct sum. For text fields, the text from multiple objects is concatenated automatically in the order of SmID.
• Weighted Mean: Indicates that the value of this field in the union result object (must be a numerical field) is the average of all merged objects for this field. It can calculate either a simple average or a weighted mean. By default, it calculates the simple average.

  Select the Average radio button, click the drop-down button on the right, and choose No Weighted Field (Average) to calculate the simple average, summing the selected field values of all source objects and dividing by the number of source objects.

  If in the drop-down menu on the right of the Average radio button, select a field, it indicates that this field is used for weighted mean calculation with the selected field in the list box.

• Save Geometry: Indicates that the value of this field in the result object is the same as the value of the corresponding field in the nth selected object. When switching selected objects, the kept objects will be highlighted on the map, allowing users to clearly identify their positions.
• Delete Source Object: This option is used to set whether to delete objects in non-current editing layers during cross-layer merge operations. By default, it is unchecked. If checked, objects in non-current editing layers will be automatically deleted after merging; if unchecked, they will be retained.
• Customize Selected Areas to Merge: Used to customize the drawing bounds to select objects for merging. Provides four methods: draw rectangle, draw polygon, draw circle, and draw sector. Select one method, draw a region on the map to select objects, and only objects within the drawn bounds will be merged.